Large-scale wind turbine generator main shaft bearing pressing tool

Abstract

The utility model provides a large-scale wind turbine generator main shaft bearing pressing tool which comprises a main shaft and a pressing assembly arranged on the peripheral wall of the main shaft and used for pressing, and the pressing assembly comprises a base arranged at one axial end of the main shaft and a pressing ring arranged in the middle of the main shaft and used for providing pre-tightening force. The base is adaptively installed corresponding to the outer edge of the axial end of the main shaft, the pressing ring is adaptively installed corresponding to the peripheral wall of the middle of the main shaft, the pressing ring and the base are fixed through a plurality of connecting pieces, the connecting pieces are evenly distributed in the circumferential direction of the axis position of the pressing ring, and after bearing hot charging, the pressing ring is fixed to the base. Pre-tightening is provided through the pressing assembly, the rigidity of the bearing is improved, it is guaranteed that when the pre-tightened bearing is subjected to working loads, radial and axial deformation of the inner ring and the outer ring is reduced, assembling of the pressing assembly is convenient, time-saving, labor-saving and cost-saving, and on-site tool assembling time is shortened.

Description

Technical Field

[0001] The utility model relates to a pressing tool for the main shaft bearing of a large wind turbine generator set. Background Art

[0002] As a clean and renewable energy source, wind energy has been increasingly valued by countries around the world. For coastal islands, grassland pastoral areas, mountainous areas and plateau regions lacking water, fuel and with inconvenient transportation, it is very suitable and promising to utilize wind power generation according to local conditions. Wind power generation refers to converting the kinetic energy of the wind into electrical energy by a wind turbine. A main bearing needs to be sleeved on the main shaft of the wind turbine. The current technology is to directly sleeve the main bearing onto the main shaft after heating the main bearing and wait for it to cool. During the cooling process of the bearing, the main bearing only presses downward by its own gravity.

[0003] Hot fitting of bearings is a method of installing bearings, which involves heating the bearings to a certain temperature to expand their inner diameters, so that they can be easily installed on the shaft. To ensure that after hot fitting the bearings, the bearing stiffness is increased through preloading, and when the preloaded bearings are subjected to working loads, the radial and axial deformations of the inner and outer rings are much smaller than those without preloading. There are currently two pressing methods: 1. Using a locking nut for preloading; by clamping the locking nut with a wrench, applying a given force to impact the wrench to rotate the nut, and at the same time tightening the locking nut with a torque wrench to generate an axial force to press the bearing. During the process of the bearing cooling to room temperature, it is necessary to apply the tightening force to the wrench multiple times to achieve a gapless fit of the bearing. The clearance value between the end face of the inner ring of the bearing and the shaft shoulder can be measured using a feeler gauge. After completing the bearing pressing, remove the wrench, and then complete the subsequent work according to the assembly process. 2. Using a hydraulic device for pressing; this method requires a rotating shaft to be arranged in the main shaft sleeve seat, and at the same time, a hydraulic mechanism ring seat is designed and installed in the main shaft sleeve seat. A piston ring is installed on the inner side of the ring seat, and a hydraulic chamber is designed between the ring seat and the piston ring. The hydraulic chamber has the functions of buffering and pushing, and the buffer of the hydraulic chamber and the preloading force of the bearing are applied to the supporting rotating shaft, thereby changing the rigidity and damping effect of the overall structure of the main shaft to achieve the preloading effect.

[0004] The above-mentioned pressing methods for the main shaft bearings of wind turbines are not applicable to on-site installation. The installation is troublesome and cumbersome, and the bearings cannot be quickly pressed and installed during the hot fitting of the bearings. It does not meet the requirements of time-saving, labor-saving and cost-saving. The installation steps are troublesome and time-consuming, and the preloading effect is poor. Therefore, a pressing tool for the main shaft bearings of large wind turbine generator sets is needed. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the utility model provides a pressing tool for the main shaft bearings of large wind turbine generator sets.

[0006] To achieve the above object, the utility model provides a pressing tooling for the main shaft bearing of a large wind turbine, which includes a main shaft and a pressing assembly arranged on the outer peripheral wall of the main shaft for pressing. The pressing assembly includes a base arranged at one axial end of the main shaft and a pressing ring arranged in the middle of the main shaft for providing a pre-tightening force. The base is adaptively installed corresponding to the outer edge of the axial end of the main shaft, and the pressing ring is adaptively installed corresponding to the outer peripheral wall of the middle of the main shaft. The pressing ring and the base are fixed through a plurality of connecting pieces, and the plurality of connecting pieces are evenly distributed circumferentially along the axial center position of the pressing ring.

[0007] Further, the pressing ring is slidably arranged on the plurality of connecting pieces, and connecting holes for cooperating with its sliding are arranged on the pressing ring corresponding to the plurality of connecting pieces, and at least one of the connecting holes is provided with a fastening bolt for fastening the position of the connecting hole.

[0008] Further, the base is provided with an installation groove corresponding to the outer edge of the end of the main shaft, and the installation groove is provided with an arc-shaped guiding surface corresponding to the outer edge of the end of the main shaft.

[0009] Further, the pressing ring includes a fixing part fixedly installed with the connecting piece and a detachable part detachably connected to the fixing part and capable of being replaced. The detachable part includes a central hole arranged corresponding to the insertion of the main shaft, and a positioning mechanism is arranged between the detachable part and the fixing part.

[0010] Further, the positioning mechanism includes a plurality of dovetail grooves evenly distributed on the inner wall of the fixing part and inserts arranged on the outer edge of the detachable part corresponding to the dovetail grooves for insertion and fixation. The detachable part is tightly connected with the dovetail grooves through the inserts.

[0011] Further, an abutting surface for abutting against the end of the insert is arranged in the dovetail groove.

[0012] The beneficial effects of the present utility model are as follows: By providing a main shaft and a pressing component arranged on the outer peripheral wall of the main shaft for pressing, a uniformly distributed pre-tightening force can be provided on the outer peripheral wall of the main shaft. The pressing ring and the base are fixed through a number of connecting pieces, and these connecting pieces are circumferentially and uniformly distributed along the axial center position of the pressing ring, ensuring the uniform distribution of the pressing force, thereby reducing local stress concentration and improving the durability of the equipment. The pressing ring is designed to provide a pre-tightening force, which helps to ensure a tight connection between the main shaft and the pressing component, thereby improving the accuracy and reliability of the test. The designs of the base and the pressing ring enable them to be conveniently installed and disassembled, facilitating maintenance and servicing. It can prevent the accidental loosening or detachment of the pressing component during operation, improving the safety of use. The design of the pressing component can adapt to different types of main shafts, improving the versatility and adaptability of the test device. After hot fitting of the bearing, the pre-tightening is provided by the pressing component to increase the bearing stiffness. When the pre-tightened bearing is subjected to a working load, the radial and axial deformations of the inner and outer rings are reduced. The assembly of the pressing component is convenient, time-saving, labor-saving, cost-saving, and follows the principle of shortening the on-site assembly tooling time. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the present utility model;

[0014] Figure 2 is a sectional structural schematic diagram of an embodiment of the present utility model;

[0015] Figure 3 is an exploded structural schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The following further describes the embodiments of the present utility model with reference to the drawings: As shown in the figure, a pressing tool for the main shaft bearing of a large wind turbine generator set includes a main shaft 1 and a pressing component arranged on the outer peripheral wall of the main shaft 1 for pressing. The pressing component includes a base 2 arranged at one axial end of the main shaft 1 and a pressing ring 3 arranged in the middle of the main shaft 1 for providing a pre-tightening force. The base 2 is adaptively installed corresponding to the outer edge of the axial end of the main shaft 1, the pressing ring 3 is adaptively installed corresponding to the outer peripheral wall in the middle of the main shaft 1, and the pressing ring 3 and the base 2 are fixed through a number of connecting pieces 4, and the number of connecting pieces 4 is circumferentially and uniformly distributed along the axial center position of the pressing ring 3.

[0017] The pressing ring 3 is slidably arranged on a plurality of connecting pieces 4. Corresponding to the plurality of connecting pieces 4, the pressing ring 3 is provided with connecting holes 5 for sliding cooperation therewith, and at least one of the connecting holes 5 is provided with a fastening bolt 6 for fastening the position of the connecting hole 5. The pressing ring 3 is slidably arranged on the connecting pieces 4, allowing the main shaft 1 to be finely adjusted in the axial direction to adapt to different test requirements or environmental changes; the fastening bolt 6 on the connecting hole 5 can fasten the position of the connecting hole 5 to ensure that the pressing ring 3 does not move excessively during the sliding process, maintaining the stability of the structure; by sliding the pressing ring 3 and using the fastening bolt 6 to fix, the position of the pressing component can be quickly adjusted, improving the convenience of operation.

[0018] Corresponding to the outer edge of the end of the main shaft 1, the base 2 is provided with an installation groove 7, and the installation groove 7 is provided with an arc-shaped guiding surface 8 corresponding to the outer edge of the end of the main shaft 1. The guiding surface can conveniently adapt to the outer edge of the end of the main shaft 1, allowing a certain installation range for the outer edge of the end of the main shaft 1 in the installation groove 7 of the base 2, facilitating installation.

[0019] The pressing ring 3 includes a fixed part 9 fixedly installed with the connecting piece 4 and a detachable part 10 detachably connected to the fixed part 9 and capable of being replaced. The detachable part 10 includes a central hole corresponding to the insertion of the main shaft 1, and a positioning mechanism is arranged between the detachable part 10 and the fixed part 9. The detachable connection design between the detachable part 10 and the fixed part 9 allows the pressing ring 3 to be conveniently disassembled when replacement or maintenance is required, improving the maintainability and service life of the equipment. The central hole provided on the detachable part 10 corresponds to the insertion of the main shaft 1, making the connection between the detachable part 10 and the main shaft 1 more convenient and simplifying the replacement process. The design of the positioning mechanism ensures the precise connection between the detachable part 10 and the fixed part 9, reducing the error during the replacement process and ensuring the use effect of the equipment.

[0020] The positioning mechanism includes a plurality of dovetail grooves 11 evenly distributed on the inner wall of the fixed part 9 and plugs 12 arranged on the outer edge of the detachable part 10 and inserted and fixed corresponding to the dovetail grooves 11. The detachable part 10 forms a fastening connection with the dovetail grooves 11 through the plugs 12.

[0021] An abutting surface for abutting against the end of the plug 12 is arranged in the dovetail groove 11. The abutting surface prevents the plug 12 from coming out.

[0022] The structure of the locking nut pressing method is complex, with high manufacturing costs, high installation costs, consuming a lot of manpower, and the larger the bearing size, the greater the pressing force required. For manual locking, the inner ring of the bearing is unevenly stressed and the bearing is easily damaged; the pressing effect is average and it is not easy to control the size of the bearing pressing force; the disassembly cost is high and it is easy to cause the biting of the thread profile of the locking nut; the influence on the installation process of other parts is low.

[0023] The structure complexity, manufacturing cost, and installation cost of the hydraulic device pressing method are relatively low, but the stress condition and pressing effect are not good, and it is easy to affect the installation of other parts during the installation process.

[0024] The structure complexity, manufacturing cost, and installation cost of this tooling are low, and it has good stress effect, good pressing effect, and low disassembly cost, and it is not easy to affect other parts.

[0025] The above embodiments are only one of the preferred specific embodiments of the present invention, and the common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A pressing tooling for the main shaft bearing of a large wind turbine, characterized in that: It includes a main shaft and a pressing assembly arranged on the outer peripheral wall of the main shaft for pressing. The pressing assembly includes a base arranged at one axial end of the main shaft and a pressing ring arranged in the middle of the main shaft for providing a pre-tightening force. The base is adaptively installed corresponding to the outer edge of the axial end of the main shaft, and the pressing ring is adaptively installed corresponding to the outer peripheral wall in the middle of the main shaft. The pressing ring and the base are fixed through a plurality of connecting pieces, and the plurality of connecting pieces are evenly distributed circumferentially along the axial center position of the pressing ring.

2. The pressing tooling for the main shaft bearing of a large wind turbine unit according to claim 1, characterized in that: The pressing ring is slidably arranged on the plurality of connecting pieces, and connecting holes for cooperating with its sliding are arranged on the pressing ring corresponding to the plurality of connecting pieces, and at least one of the connecting holes is provided with a fastening bolt for fastening the position of the connecting hole.

3. The large wind turbine main shaft bearing pressing tooling according to claim 2, characterized in that: The base is provided with an installation groove corresponding to the outer edge of the end of the main shaft, and the installation groove is provided with an arc-shaped guiding surface corresponding to the outer edge of the end of the main shaft.

4. The large wind turbine main shaft bearing pressing tooling according to claim 1, wherein: The pressing ring includes a fixing part fixedly installed with the connecting piece and a detachable part detachably connected with the fixing part and capable of being replaced. The detachable part includes a central hole arranged corresponding to the insertion of the main shaft, and a positioning mechanism is arranged between the detachable part and the fixing part.

5. The pressing tooling for the main shaft bearing of a large wind turbine according to claim 4, characterized in that: The positioning mechanism includes a plurality of dovetail grooves evenly distributed on the inner wall of the fixing part and plugs arranged on the outer edge of the detachable part for plugging and fixing corresponding to the dovetail grooves. The detachable part is tightly connected with the dovetail grooves through the plugs.

6. The large wind turbine main shaft bearing pressing tooling according to claim 5, characterized in that: An abutting surface for abutting against the end of the plug is arranged in the dovetail groove.

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